linux-kernel - Re: [RFC/PATCH 4/7] x86, mm: Wrap ZONE_DMA32 with CONFIG_ZONE

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Date:	Mon, 31 Oct 2011 15:52:21 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Pekka Enberg <penberg@...nel.org>
cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Yinghai Lu <yinghai@...nel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Arun Sharma <asharma@...com>
Subject: Re: [RFC/PATCH 4/7] x86, mm: Wrap ZONE_DMA32 with
 CONFIG_ZONE_DMA32

On Fri, 28 Oct 2011, Pekka Enberg wrote:

> In preparation for unifying 32-bit and 64-bit zone_sizes_init() make sure
> ZONE_DMA32 is wrapped in CONFIG_ZONE_DMA32.
> 
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Yinghai Lu <yinghai@...nel.org>
> Cc: H. Peter Anvin <hpa@...ux.intel.com>
> Cc: David Rientjes <rientjes@...gle.com>
> Signed-off-by: Pekka Enberg <penberg@...nel.org>

Acked-by: David Rientjes <rientjes@...gle.com>

Adding Arun Sharma to the cc, he was interested in disabling 
CONFIG_ZONE_DMA32 and I believe carries this patch internally (as we do).

> ---
>  arch/x86/mm/init_64.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 3ddda59..a9214e6 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -620,7 +620,9 @@ static void __init zone_sizes_init(void)
>  #ifdef CONFIG_ZONE_DMA
>  	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
>  #endif
> +#ifdef CONFIG_ZONE_DMA32
>  	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
> +#endif
>  	max_zone_pfns[ZONE_NORMAL] = max_pfn;
>  
>  	free_area_init_nodes(max_zone_pfns);
--
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